Is there a detection clear event in Frigate?

[my-umd]

Maybe an answered question. For motion detection, there is a clear event. But for object detection, I seems not finding such event? What I want to do is to set up an automation, when a person is detected in my porch, turn on porch light. Looks simple, but I don't know when to turn the light off. Thinking to turn off light when no person is detected. What is a good event to use? The occupancy binary sensor?
I see people use a timer. Do not think it is a good approach. Thanks.

[NickM-27]

Yes the MQTT events topic has an event ended message (type: end)

[my-umd]

Thanks for confirming @NickM-27. Another reason I ask this is that, in Home Assistant, when a person is detected, the snapshot is always shown with an 'active' state, even though the event has been passed for hours (i.e., the person has left). I am not sure if this is by design. But it makes me thinking there might not be an appropriate event fired to notify Home Assistant to change the state.

[NickM-27]

Thanks for confirming @NickM-27. Another reason I ask this is that, in Home Assistant, when a person is detected, the snapshot is always shown with an 'active' state, even though the event has been passed for hours (i.e., the person has left). I am not sure if this is by design. But it makes me thinking there might not be an appropriate event fired to notify Home Assistant to change the state.

"Active" on that entity simply means it has an image. It means nothing really.

[my-umd]

I see. Thanks @NickM-27. Looks I miss understood that label.

[blakeblackshear]

I use the automatically created zone sensor for person count to turn on lights and turn them off after it has dropped to 0 for a period of time.

[my-umd]

Cool! Thanks @blakeblackshear.
Using person count is a good idea. I was actually thinking how to deal with a bunch of people :)